Cubic boron nitride radius end mill
AssigneeSumitomo Electric Hardmetal Corp.
InventorKazuo Maeda
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Abstract
A cubic boron nitride radius end mill includes a sintered cubic boron nitride compact bonded to an end of a main body, and a cutting edge provided on the sintered cubic boron nitride compact. The wedge angle θt of the cutting edge is constant over the entire region of the cutting edge. A negative rake face is disposed on a face so as to extend over the entire region of the cutting edge, and the rake angle θn of the negative rake face satisfies the relationship −30°≦θn≦−50°. A joint cutting edge is disposed between an end cutting edge and a radius cutting edge in the cutting edge, the joint cutting edge having a concave angle γ0 which is smaller than the concave angle γ1 of the end cutting edge and which satisfies the relationship 0.5°≦γ0≦2°.
Claims6
A cubic boron nitride radius end mill having a cutting edge composed of sintered cubic boron nitride, comprising:
- a sintered cubic boron nitride compact bonded to an end of a main body;
- and
- the cutting edge provided on the sintered cubic boron nitride compact,
- wherein the wedge angle θt of the cutting edge is constant over the entire region of the cutting edge,
- a negative rake face is disposed on a face so as to extend over the entire region of the cutting edge,
- the rake angle θn of the negative rake face satisfies the relationship −30°≦θn≦−50°, and
- a joint cutting edge is disposed between an end cutting edge and a radius cutting edge in the cutting edge, the joint cutting edge having a concave angle γ0 which is smaller than the concave angle γ1 of the end cutting edge and which satisfies the relationship 0.5°≦γ0≦2°.
Dependencies are inferred from the claim text.